The celebrity cat, famed for her sassy internet memes, died after a urinary tract infection on May 14, with the news released today. "We are unimaginably heartbroken to announce the loss of our beloved Grumpy Cat", a note posted to the cat's Twitter page on May 17 read.
One fan wrote: "I loved this cat".
Bundesen denied reports that she had made as much as $100 million from the cat's fame, but has declined to say how much her pet earned. Grumpy Cat's online stardom quickly translated into a real-world empire with a Christmas film, a Madame Tussauds wax figure, and a range of merchandise including soft toys, clothing and a fragrance.
Grumpy, whose real name is Tardar Sauce, became an internet sensation after her owner Tabatha Bundesen posted a picture of her scowl six years ago.
The note continued, "Besides being our baby and a cherished member of the family, Grumpy Cat has helped millions of people smile all around the world - even when times were tough".
Grumpy Cat first emerged on the meme scene in 2012 when her grumpy facial expression caught the eye of Reddit users. She's done television commercials for Honey Nut Cheerios and took photos with hundreds of fans at South by Southwest. They captioned the post, "Some days are grumpier than others..."
Owner Tabatha Bundesen founded Grumpy Cat Ltd. and created a website that included an online shop featuring 884 items, including T-shirts and mugs with the cat's picture.
During her years in the limelight, she accumulated 8.3 million total followers on Facebook, 2.4 million followers on Instagram and 1.5 million followers on Twitter.